A psychological sci-fi thriller written and directed by Eric Bress and J. Mackye Gruber, this 2004 film is named after a popular hypothetical example of chaos theory depicting how small initial differences may lead to large unforeseen consequences over time. Ashton Kutcher plays the main character, Evan Treborn, who as a young adult discovers that he has the ability to travel back in time to inhabit his former self and change the present. Having been the victim of several childhood traumas aggravated by stress-induced memory losses, Evan attempts to set things right for himself and his friends, but there are unintended consequences for all. Amy Smart plays his childhood sweetheart, Kayleigh.